KR20090073903A - Method for arranging pixel in color electronic paper display device - Google Patents

Abstract

A method for arranging pixels in a color electronic paper display device is provided to apply a different pixel arrangement method according to resolution by model and an application, thereby improving visuality of the color electronic paper display device. Color filters of RGB(Red,Green,Blue) and a filter area of white are arranged to respectively correspond to pixel electrodes formed in a unit pixel area of the first substrate. When gray is black under middle gray or almost black in a W pixel, pixels of G, R, B, and W form pixel arrangement by a quad type in an odd numbered horizontal line and an even numbered horizontal line or form pixel arrangement by a quad type in an odd numbered vertical line and an even numbered vertical line.

Description

METHODS FOR ARRANGING PIXEL IN COLOR ELECTRONIC PAPER DISPLAY DEVICE}

The present invention relates to a pixel arrangement method of a color EPD device, and more particularly, red (R), green (G), and blue arranged around the unit pixel of white (W) according to a driving algorithm of the EPD device. The pixel arrangement method of the color EPD apparatus to adjust and arrange the subpixel of (B) is related.

Recently, EPD devices have been in the spotlight as display devices that are comfortable to read without being stressed, such as e-books and e-papers. Such an EPD device is required to be easy to read, which is thin, lightweight, durable, and allows the content to be viewed as printed. In addition, as the color content is gradually increased, the EPD device is required to display the content in color. As a color EPD device capable of satisfying various consumer needs, a reflective color display device without a backlight and reducing power consumption may be used.

In this regard, an EPD device using an electrophoretic device is known as a reflective display device. Hereinafter, an EPD device using a microcapsule type electrophoretic device will be described.

1 is a view schematically showing a cross-sectional structure of a color EPD device according to the prior art.

As shown in FIG. 1, the color EPD apparatus has a color filter 15 of red (R), green (G), and blue (B), and the filter area of the bag (W) without a separate color filter 15. And a color filter substrate 10 having a thin film transistor, a TFT array substrate 20 on which a thin film transistor (TFT) is formed, and a film-shaped EPD film 30 formed between the two substrates.

Here, the TFT array substrate 20 is formed in a four-layer structure. The first layer closest to the EPD film 30 is formed of a plurality of pixel electrodes P. As shown in FIG. The second and third layers each comprise an insulating layer (not shown) each comprising a plurality of TFTs corresponding to any one of the pixel electrodes P in a one-to-one relationship. In the second layer, the drain electrode D and the source electrode S corresponding to any one of the TFTs are formed in a one-to-one relationship. In the third layer, gates G corresponding to any one of the TFTs are formed in a one-to-one relationship. The source electrode S of each TFT is connected to the corresponding pixel electrode P. As shown in FIG. The fourth layer, which is the lowest layer, is a base-body layer made of glass formed to integrally support the first to third layers.

In addition, a gate line is formed in the horizontal direction on the SUS substrate 21 constituting the TFT array substrate 20, and a gate electrode G is formed to extend to the gate line to form a part of the TFT. The insulating film 22 is formed on the SUS substrate 21 in which (G) was formed. On the insulating film 22, a data line crossing the gate line orthogonal to the gate line, a drain electrode D extending to the data line and partially overlapping the gate electrode G, and a drain electrode D thereof. The source electrode S, which is partially overlapped with the gate electrode G, is formed. In addition, the passivation layer 23 is formed on the data line, the source electrode S, and the drain electrode D. The pixel electrode 25 is formed on the passivation layer 23 of the unit pixel region. The silver is connected to the source electrode S of the TFT through a contact hole (not shown) on the protective film 23.

The color filter substrate 10 is formed on a transparent plastic substrate 11 made of polyethylene terephthalate (PET) or the like, and is formed on the plastic substrate 11 and corresponds to each pixel electrode P of the TFT array substrate 20. A color filter in which red (R), green (G), and blue (B) resists are sequentially formed on the black matrix 13 partitioning the substrate and the plastic substrate 11 partitioned by the black matrix 13 ( 15) and the filter area of the bag (W) and the surface consisting of the black matrix 13, the color filter 15 and the transparent conductive film formed on the filter area facing the pixel electrode P of the TFT array substrate 20. It consists of an electrode 17.

In addition, the film-like EPD film 30 includes a microcapsule 32 spread inwardly and a binder 31 made of a polymer filled between the microcapsules 32 to bond the microcapsules 32. . Each microcapsule 32 reaches a size of about 40 μm, and a solvent (not represented) made of IPA (isopropyl alcohol) or the like is encapsulated by being sealed inside each microcapsule 32. At this time, in the solvent, white particles 33, which are titanium oxide-based white pigments having nano-sizes, and black particles 34, which are nano-size, carbon-based black pigments, are spread by a dispersion method, and each white particle 33 is dispersed. It has a negative polarity and each black particle 34 has a positive polarity.

Through this structure, for example, the light transmitted through the color filter 15 of green (G) is reflected by each microcapsule 32 in a white display state lying on the pixel electrode P, and the color of G It passes through the filter 15 to the human eye. Eventually, green can be recognized by this principle.

Usually, the pixel arrangement method of the reflective color EPD device as described above is arranged in the order of R, G, B, and W in the clockwise direction with respect to R, as shown in FIGS. Four-color quad type is generally formed arranged in the order of R, G, W, B in the direction.

However, in the pixel arrangement method, as shown in the drawing, G and W arranged in the vertical direction or the diagonal direction feel particularly brighter than the colors of the other R and B, so that the luminance difference is generated for each line and the visibility is deteriorated.

The present invention has been made to solve the above problems, the object of which is the dot (dot) around the basis of the unit pixel of the white (W) according to the resolution of the model and the application of the application (application) of the product (application) A method of arranging pixels of a color EPD device in which a method of arranging peripheral sub-pixels forming a pixel is determined is provided.

A pixel arrangement method of a color EPD device according to a first embodiment of the present invention for achieving the above object is a plurality of gate lines and data lines that are formed to cross each other and define a unit pixel region, and the gate line and data lines A first substrate including a thin film transistor formed at an intersection region of the pixel and a pixel electrode formed at the unit pixel region; Red (R), green (G), blue (B) color filters and bags (W) filter regions disposed corresponding to pixel electrodes formed on the unit pixel regions of the first substrate, and the color filter image. A second substrate formed in the substrate and including a common electrode facing the pixel electrode; In the color EPD device provided between the first substrate and the second substrate, a plurality of microcapsules forming an electrophoretic device comprises an EPD film sealed with a binder to form a film,

When the gray of the W pixel is equal to or less than the middle gray and is black or close to black, the pixel array of G, R, B, and W is formed in the quadratic horizontal line and the even horizontal line in quad form, or the odd number The pixels are arranged in a pixel array of G, R, B, and W in a quad type in the vertical line and the even-th vertical line.

In addition, the pixel arrangement method of the color EPD device according to the second embodiment of the present invention is formed on a plurality of gate lines and data lines crossing each other and defining unit pixel regions, and formed at the intersections of the gate lines and the data lines. A first substrate including a thin film transistor and a pixel electrode formed in the unit pixel region; Red (R), green (G), blue (B) color filters and bags (W) filter regions disposed corresponding to pixel electrodes formed on the unit pixel regions of the first substrate, and the color filter image. A second substrate formed in the substrate and including a common electrode facing the pixel electrode; In the color EPD device provided between the first substrate and the second substrate, a plurality of microcapsules forming an electrophoretic device comprises an EPD film sealed with a binder to form a film,

When the gray in the W pixel is equal to or less than the middle gray and is black or close to black, a pixel array of G, R, B, and W is formed on the odd horizontal line and the even horizontal line in the odd-numbered horizontal line, or the odd-numbered number. The pixels are arranged in the vertical line and the even-th horizontal line by forming a pixel array of G, R, B, and W in a stripe type.

In the pixel arrangement method of the color EPD device according to the third embodiment of the present invention, a plurality of gate lines and data lines that cross and form each other to define a unit pixel region, and a thin film transistor formed at an intersection region of the gate line and the data line A first substrate including a pixel electrode formed in the unit pixel region; Red (R), green (G), and blue (B) color filters and bags (W) filter regions respectively disposed corresponding to pixel electrodes formed on the unit pixel regions of the first substrate, and the color filter image. A second substrate formed in the substrate and including a common electrode facing the pixel electrode; In the color EPD device provided between the first substrate and the second substrate, a plurality of microcapsules forming an electrophoretic device comprises an EPD film sealed with a binder to form a film,

When the gray of the W pixel is equal to or greater than the middle gray and is white or close to white, the pixel arrays of the first group of G, R, B, and W are quadrangular from the horizontal line of the first column and the horizontal line of the second column. The first group and the second group of pixels are alternately formed to form a pixel array of the second group B, W, G, and R in a quadrangle in the horizontal lines of the third column and the fourth column, or the first column is vertical The first group of G, R, B, and W pixels are arranged in a quad type on the vertical lines of the line and the second column, and the second group of B, W, G is quad type in the vertical lines of the third column and the fourth column. The pixels of the first group and the second group are alternately arranged to form a pixel array of R.

In the pixel arrangement method of the color EPD device according to the fourth embodiment of the present invention, a plurality of gate lines and data lines that cross and form each other to define a unit pixel area, and a thin film transistor formed at an intersection area of the gate line and the data line A first substrate including a pixel electrode formed in the unit pixel region; Red (R), green (G), blue (B) color filters and bags (W) filter regions disposed corresponding to pixel electrodes formed on the unit pixel regions of the first substrate, and the color filter image. A second substrate formed in the substrate and including a common electrode facing the pixel electrode; In the color EPD device provided between the first substrate and the second substrate, the plurality of microcapsules forming the electrophoretic device comprises an EPD film sealed with a binder to form a film,

When the gray in the W pixel is equal to or greater than the middle gray and is white or close to white, the pixel arrays of the first group of G, R, B, and W are formed in the stripe type from the odd horizontal line and in the even horizontal line. The first group and the second group of pixels are alternately formed to form a pixel array of the second group B, W, G, and R in the stripe type, or the first group G, R, The pixels of the first group and the second group are alternately arranged to form a pixel array of B and W, and to form a pixel array of the second group of B, W, G, and R in the stripe type on the even-numbered vertical line. .

As a result of the above method, the present invention can eliminate the luminance difference felt for each line compared to the conventional one by applying different pixel arrangement methods according to the resolution and application of each color EPD device, thereby improving visibility of the color EPD device. .

Hereinafter, the pixel arrangement method of the color EPD device according to the resolution of each model will be described in more detail with reference to the accompanying drawings.

FIG. 3 is a cross-sectional view showing a driving state of a color EPD device according to a first embodiment of the present invention, showing when a low resolution image of black (or almost black) is implemented as gray of a medium level or less in a unit pixel of W; FIG. to be.

As shown in FIG. 3, a low-resolution color EPD device according to a first embodiment of the present invention includes a plurality of gate lines and data lines crossing and being formed to define a unit pixel area, and a plurality of gate lines and data lines. A first substrate 100 including a thin film transistor formed at an intersection area and a pixel electrode formed at the unit pixel area; Red (R), green (G), and blue (B) color filters 115a, 115b, and 115c disposed corresponding to the pixel electrodes 105 formed on the unit pixel region of the first substrate 100, and The common electrode formed on the filter area 115d of the bag W, the R, G, B color filters 115a, 115b, 115c, and the W filter area 115d and facing the pixel electrode 105 ( A second substrate 110 including 117; A plurality of microcapsules 122 formed between the first substrate 100 and the second substrate 110 and forming an electrophoretic device are sealed together with the binder 121 to include an EPD film 120. Consists of. In this case, the microcapsule 122 includes a white particle 123 which is a titanium oxide-based white pigment having a nano size, and black particles 124 having a nano size and a carbon black pigment.

First, the first substrate 100 is formed on a glass substrate 101 or a plastic substrate and crosses each other to define a plurality of gate lines and data lines defining a unit pixel region, and a unit pixel defined by the gate lines and data lines. And a TFT formed in an area where the gate line and the data line cross each other.

In addition, on the SUS substrate 101 constituting the first substrate 100, a gate line is formed in a horizontal direction, a gate electrode G extending to the gate line to form a part of the TFT is formed, and the gate electrode. An insulating film 102 is formed on the SUS substrate 101 on which (G) is formed. On the insulating film 102, a data line crossing the gate line orthogonal to the gate line, a drain electrode D extending to the data line and partially overlapping the gate electrode G, and a drain electrode D thereof. A source electrode S is formed on the gate electrode G so as to face each other. In addition, the passivation layer 103 is formed on the data line, the source electrode S, and the drain electrode D, and the pixel electrode 105 is formed on the passivation layer 103 of the unit pixel region. 105 is connected to the source electrode S of the TFT via a contact hole (not shown) on the protective film 103.

Meanwhile, the second substrate 110 may include a black matrix 113 that partitions an area facing the pixel electrode 105 formed on the unit pixel of the first substrate 100 on the glass substrate 111, and the black matrix ( R, G, and B resists are sequentially formed on the plastic substrate 111 in the region partitioned by 113 to correspond to the unit pixels on the first substrate 100, respectively, and implement R, G, and B colors. , G, B color filters 115a, 115b, 115c and W filter area 115d for implementing W (or black (B)) color without forming a separate color filter, and black matrix 113 and R, G And a common electrode 117 formed on the B color filters 115a, 115b, and 115c and the filter region 115d of the W to form an electric field facing the pixel electrode 105 on the first substrate 110. It is composed.

In addition, an EPD film 120 is formed between the first substrate 100 and the second substrate 110. The EPD film 120 is formed by sealing a plurality of microcapsules 122 constituting the electrophoretic device by the binder 121. The EPD film 120 is laminated when the second substrate 110 is formed or the first substrate 100 is formed. Laminate is formed to form the EPD film 120.

The microcapsules 122 include white particles 124 and black particles 123 having different charge values, such that the pixel electrode 105 and the second substrate 110 of the first substrate 100 are included. The white particles 123 and the black particles 124 in the microcapsules 122 are charged to the two electrodes 105 and 117 respectively according to the voltage applied to the common electrode 117 of the R on the second substrate 110. The light passing through the G, B color filters 115a, 115b, and 115c and the W filter region 115d is reflected or absorbed again.

In this case, in the present invention, the pixel electrode 105 on the first substrate 100 and the second substrate 110 are common to implement a low-resolution image of black, which is typically the lowest gray level among the W gray pixels. The voltage applied to the electrode 117 is adjusted to form the EPD film 220 on the color filter 115a of R, the color filter 115b of G and the color filter 115c of B on the second substrate 110. The black particles in the microcapsules 122 move the white particles 123 in the microcapsules 122 in the direction of the color filter on the second substrate 110 while forming the EPD film 120 in the filter region 115d of W. The particles 124 are moved in the direction of the color filter on the second substrate 110.

In this case, light incident from the outside and transmitted through the color filters 115a, 115b, and 115c of R, G, and B, respectively, is reflected through the white particles 123 of the microcapsules 122 forming the EPD film 120. This results in a color image.

On the other hand, the light incident from the outside and transmitted through the filter region 115d of W is absorbed by the black particles 124 of the microcapsules 122 forming the EPD film 120 to realize black.

In the present invention, in the low resolution color EPD device in which the image is implemented, the pixel arrangement method is determined by three types according to the application type. In other words, depending on the type of application, the color EPD device forms a square with the same length in the horizontal and vertical directions at 4: 4 ratio, or uses the horizontal direction longer than the vertical direction at 4: 3 ratio. The pixel arrangement method of the color EPD device is applied differently according to a landscape type or a portrait type which uses the horizontal direction shorter than the vertical direction in a 3: 4 ratio.

FIG. 4A is a diagram illustrating a quad pixel arrangement method when the color EPD device of FIG. 3 is a low resolution square or landscape type, and FIG. 4B is a stripe type when the color EPD device of FIG. 3 is a low resolution square or land skate type. Is a diagram showing a pixel arrangement method of a type).

As shown in FIG. 4A, the G, R, B, and W pixels forming the quad type are repeatedly formed in the color EPD device. In this case, the pixels of G, R, B, and W are formed in a quad type in the horizontal lines of the first and second columns, and are formed in the order of G, R, W, and B in a clockwise direction with respect to G. It is formed in quad type in the order of G, R, W, B in the clockwise direction with respect to G in the horizontal lines of 3rd and 4th row. As a result, the pixels of G, R, B, and W are formed in a quad type by forming the same pixel array in the vertical lines of the first and second columns, and quad by forming the same pixel array in the vertical lines of the third and fourth columns. It is formed by a type.

In addition, as illustrated in FIG. 4B, pixels G, R, B, and W that form a stripe may be repeatedly formed in the color EPD device. That is, the pixels of G, R, B, and W have a stripe type of pixels in the odd-numbered and even-numbered horizontal lines. However, the present invention is not limited to this, but the pixels of G, R, B, and W may be formed in a stripe type in the odd and even vertical lines.

In this case, the horizontal and vertical lengths of the unit pixels of G, R, B, and W are equally formed in a 1: 1 ratio. As described above, in the case of a low-resolution color EPD device, the light reflectance of the W pixel is less than or equal to medium gray and almost black. As a result, the G pixel, which is relatively bright compared to other colors, is hardly affected or hardly affected.

5A is a diagram illustrating a quad pixel arrangement method when the color EPD device of FIG. 3 is a portrait type having a low resolution of 3: 4, and FIG. 5B is a stripe type when the color EPD device of FIG. 3 is a portrait type with a low resolution; It is a figure which shows the pixel arrangement method of a type.

As shown in FIG. 5A, in the color EPD device, pixels of G, R, B, and W forming a quad type are repeatedly formed. In other words, the pixels of G, R, B, and W are formed in a quad type in the horizontal line of the first column and the horizontal line of the second column, and are formed in the order of G, R, W, and B in a clockwise direction with respect to G. In addition, in the horizontal lines of the third row and the fourth row, the quadrangle is formed in the same manner as described above. As a result, the pixels form a quad type in the same manner in the vertical lines of the first and second columns, and the pixels form the same quad form in the vertical lines of the third and fourth columns.

In addition, as shown in FIG. 5B, the color EPD device may be formed by repeating the G, R, B, and W pixels forming the stripe type. That is, the pixels of G, R, B, and W have a stripe type of pixels in the odd-numbered and even-numbered horizontal lines. In this case, the G, R, B, and W pixels in the horizontal line direction are not formed in the stripe type, but the pixels of the G, R, B, and W stripes in the odd and even vertical lines. It can be formed as.

At this time, the horizontal and vertical lengths of the unit pixels of G, R, B, and W are longer than the horizontal length in the ratio of 1: a. That is, where a is a positive integer greater than one. As described above, in the case of the low-resolution color EPD device, since the light reflectance of the W pixel is less than or equal to the middle gray, it is almost black, so that it is hardly affected or hardly affected by the relatively bright G pixel.

FIG. 6 is a cross-sectional view illustrating a driving state of a color EPD device according to a second exemplary embodiment of the present invention, and illustrates a case where a high resolution image of white (or almost white) is implemented as a gray level or more in a W pixel.

As shown in FIG. 6, a low-resolution color EPD device according to a second embodiment of the present invention includes a plurality of gate lines and data lines crossing and being formed to define a unit pixel area, and a plurality of gate lines and data lines. A first substrate 220 including a thin film transistor (TFT) formed in an intersection area and a pixel electrode 205 formed in the unit pixel area; Red (R), green (G), and blue (B) color filters 215a, 215b, and 215c respectively disposed in correspondence with the pixel electrode 205 formed on the unit pixel area of the first substrate 220; A common electrode formed on the filter area 215d of the bag W, the R, G, B color filters 215a, 215b, 215c, and the filter area 215d of the W and facing the pixel electrode 205. A second substrate 210 including 217; A plurality of microcapsules 222 provided between the first substrate 200 and the second substrate 210 and forming an electrophoretic device are sealed together with the binder 221 to include an EPD film 220. Consists of. In this case, the microcapsule 222 includes a white particle 223 which is a titanium oxide-based white pigment having a nano size and a black particle 224 having a nano size and a carbon-based black pigment.

First, the first substrate 200 is formed on a glass substrate 201 or a plastic substrate to cross each other, a plurality of gate lines and data lines defining a unit pixel region, and a unit pixel defined by the gate lines and data lines. A pixel electrode 205 formed in the region, and a TFT formed in the region where the gate line and the data line intersect.

In addition, a gate line is formed in the horizontal direction on the SUS substrate 201 constituting the first substrate 200, and a gate electrode G that extends to the gate line to form a part of the TFT is formed. The insulating film 202 is formed on the SUS substrate 201 in which (G) was formed. On the insulating film 202, a data line intersecting the gate line orthogonally intersects with the drain electrode D, which extends to the data line and partially overlaps the gate electrode G, and the drain electrode D. On the gate electrode G, a source electrode S having a portion overlapped is formed. In addition, the passivation layer 203 is formed on the data line, the source electrode S, and the drain electrode D, and the pixel electrode 205 is formed on the passivation layer 203 of the unit pixel region. 205 is connected to the source electrode S of the TFT via a contact hole (not shown) on the protective film 203.

On the other hand, the second substrate 210 is a black matrix 213 partitioning a region facing the pixel electrode 205 formed on the unit pixel of the first substrate 200 on the glass substrate 211, and the black matrix ( R, G, and B resists are sequentially formed on the plastic substrate 211 in a region partitioned by 213 to correspond to the unit pixels on the first substrate 200, respectively, and to implement colors of R, G, and B. , G, B color filters 215a, 215b, 215c and W filter area 215d for realizing W color without forming a separate color filter, and black matrix 213 and color filters 215a of R, G, B , 215b and 215c, and a common electrode 217 formed on the filter region 215d of W to form an electric field facing the pixel electrode 205 on the first substrate 200.

In addition, an EPD film 220 is formed between the first substrate 200 and the second substrate 210. The EPD film 220 is formed by sealing a plurality of microcapsules 222 constituting the electrophoretic device by the binder 221. When the second substrate 210 is formed, the EPD film 220 is laminated or formed when the first substrate 200 is formed. It is laminated to form the EPD film 220.

The microcapsule 222 includes white particles 223 and black particles 224 having different charge values, such that the pixel electrode 205 and the second substrate 210 of the first substrate 200 are included. The white particles 223 and the black particles 224 in the microcapsules 222 are charged to the two electrodes 205 and 217, respectively, according to the voltage applied to the common electrode 217 of the R on the second substrate 210. The light passing through the G, B color filters 215a, 215b, and 215c and the W filter area 215d is reflected or absorbed again.

At this time, in the present invention, the pixel electrode 205 on the first substrate 200 and the second substrate 210 are common to implement a high-resolution image of white, which is typically the highest gray level among the W gray pixels. The voltage applied to the electrode 217 is adjusted to form the EPD film 220 in the color filter 215a of R, the color filter 215b of G and the color filter 215c of B on the second substrate 210. White in the microcapsule 222 that moves the white particles 223 in the microcapsules 222 in the direction of the color filter on the second substrate 210 and forms the EPD film 220 in the filter region 215d of W. The particles 223 are moved in the direction of the color filter on the second substrate 210.

In this case, light incident from the outside and transmitted through the color filters 215a, 215b, and 215c of R, G, and B, respectively, is reflected through the white particles 224 of the microcapsules 222 forming the EPD film 220. This results in a specific color image.

In addition, the light incident from the outside and transmitted through the filter region 215d of W, respectively, is reflected through the white particles 124 of the microcapsules 222 forming the EPD film 220 to realize white.

In the present invention, in the high resolution color EPD device in which the image is implemented, the pixel arrangement method is determined by three types according to the application type. In other words, depending on the type of application, the color EPD device forms a square with the same length in the horizontal and vertical directions at 4: 4 ratio, or in landscape type using the horizontal direction longer than the vertical direction at 4: 3 ratio. Alternatively, the pixel arrangement method of the color EPD device can be applied differently according to the portrait type using the horizontal direction shorter than the vertical direction in a 3: 4 ratio.

FIG. 7A is a diagram illustrating a quad pixel arrangement method when the color EPD device of FIG. 6 is a high resolution square or landscape type, and FIG. 7B is a stripe type when the color EPD device of FIG. 6 is a high resolution square or landscape type. A diagram showing a pixel arrangement method of a stripe) type.

As shown in FIG. 7A, pixels of a first group of G, R, B, and W, and pixels of a second group of B, W, G, and R are alternately formed. That is, the pixels of the first group of G, R, B, and W arranged in a quad type in the vertical lines of the first and second columns, and arranged in the order of G, R, W, and B in a clockwise direction with respect to G. And the second group of B, W, G, and R arranged in quadrangle lines in the vertical lines of the third and fourth columns, and arranged in the order of B, W, R, and G in a clockwise direction with respect to B. The pixels are formed. In addition, the present invention is arranged in a quad type in the horizontal lines of the first column and the second column, G, R, B, of the first group arranged in the order of G, R, W, B in the clockwise direction with respect to G A second group of B, W, and G arranged in quads in the pixels of W and in the horizontal lines of the third and fourth columns, and arranged in the order of B, W, R, and G in a clockwise direction with respect to B. , R pixels may be formed. In addition, the first group of G, R, B, and W pixels arranged in a quad type and the second group of B, W, G, and R pixels may be alternately formed in a diagonal direction.

In addition, as shown in FIG. 7B, the pixels of the first group G, R, B, and W that form a stripe and the pixels of the second group of B, W, G, and R are alternately formed. In this case, the pixels of the first group G, R, B, and W are arranged in the odd horizontal lines, while the pixels of the second group of B, W, G, and R are arranged in the even-numbered horizontal lines. . However, the present invention is not limited thereto, but the pixels of the first group of G, R, B, and W are arranged in the odd vertical lines, while the pixels of the second group of B, W, G, and R are even. It may be formed arranged in a vertical line.

At this time, the horizontal and vertical lengths of the pixels of G, R, B, and W forming the first group and the unit pixels of B, W, G, and R forming the second group are equally formed in a 1: 1 ratio. have. As described above, in the case of the high-resolution color EPD device, since the light reflectance of the W pixel is more than the middle gray and almost close to white, the pixel array of the first group and the pixel array of the second group are excluded to maximize the effect of the G pixel, which feels relatively bright. To form.

FIG. 8A is a diagram illustrating a quad pixel arrangement method when the color EPD device of FIG. 6 is a high resolution 3: 4 ratio; FIG. 8B is a stripe type pixel when the color EPD device of FIG. 6 is a high resolution portrait. It is a figure which shows an arrangement method.

As shown in FIG. 8A, the pixels of the first group G, R, B, and W and the pixels of the second group of B, W, G, and R are alternately formed. That is, the pixels of the first group of G, R, B, W are arranged in a quad type in the vertical lines of the first column and the second column, and are arranged in the order of G, R, W, and B in a clockwise direction with respect to G. And pixels of the second group of B, W, G, and R arranged in quadrangle lines in the vertical lines of the third and fourth columns, and arranged in the order of B, W, R, and G in a clockwise direction with respect to B. Are formed. In addition, the present invention is arranged in a quad type in the horizontal line of the first column and the second column, G, R, B, W of the first group arranged in the order of G, R, W, B in the clockwise direction with respect to G And a second group of B, W, G, arranged in quads in the horizontal lines of the third and fourth columns, and arranged in the order of B, W, R, and G in a clockwise direction with respect to B. The pixels of R can be formed. In addition, the pixels of the first group G, R, B, and W arranged in a quad type and the pixels of the second group of B, W, G, and R may be alternately formed in a diagonal direction.

In addition, as illustrated in FIG. 8B, the pixels of the first group G, R, B, and W that form a stripe, and the pixels of the second group of B, W, G, and R are alternately formed. In this case, the pixels of the first group G, R, B, and W are arranged in the odd horizontal lines, while the pixels of the second group of B, W, G, and R are arranged in the even-numbered horizontal lines. . However, the present invention is not limited thereto, but the pixels of the first group of G, R, B, and W are arranged in the odd vertical lines, while the pixels of the second group of B, W, G, and R are even. It may be formed arranged in a vertical line.

At this time, of course, the horizontal and vertical lengths of the pixels of G, R, B, and W forming the first group and the unit pixels of B, W, G, and R forming the second group may have a length of 1: a. It is formed longer than the horizontal length. A is a positive integer greater than one. As described above, in the case of the high-resolution color EPD device, since the light reflectance of the W pixel is about medium or more and almost close to the white, the pixel array of the first group and the second group are excluded in order to exclude the effect on the G pixel which is relatively bright. A pixel array is formed.

On the other hand, the intermediate gray in the W pixel according to the first and second embodiments of the present invention as described above is, for example, the pixel electrodes 105, 205 and the second substrate (1) on the first substrate (100, 200) The voltages applied to the common electrodes 117 and 217 on the 110 and 210 are adjusted to adjust the color filters 115a and 215a of R, the color filters 115b and 215b of the G and the B on the second substrate 110 and 210. The white particles 123 and 223 in the microcapsules 122 and 222 forming the EPD films 120 and 220 in the color filters 115c and 215c are disposed on the color filters 115 and 215 on the second substrate 110 and 210. The white particles 123 and 223 and the black particles 124 and 224 in the microcapsules 122 and 222 which move in the direction and form the EPD films 120 and 220 in the filter regions 115d and 215d of W. While moving in the direction of the color filter on the second substrate (110, 210), it controls the pulse width modulation (pulse width modulation) for a predetermined time, that is, the time (T) to which the voltage is applied. For example, half of the white particles 123 and 223 or the entire black particles 124 and 224 in the microcapsules 122 and 222 are moved toward the color filter to realize gray positioned at the center of black and white. This can be done by pulse width modulation corresponding to.

In the present invention, by adjusting the pulse width modulation of the two voltages applied to the unit pixels of R, G, B, and W as described above, a color less than or equal to black or near black based on the intermediate gray can be realized. White or near white color can be achieved.

1 schematically illustrates a cross-sectional structure of a color EPD device according to one example of the prior art;

FIG. 2 is a diagram illustrating a pixel arrangement structure of R, G, B, and W formed on the color filter substrate of FIG.

FIG. 3 is a cross-sectional view showing a driving state of a color EPD device according to a first embodiment of the present invention, showing when a low resolution image of black (or almost black) is implemented as gray of a medium level or less in a unit pixel of W; FIG.

4A is a diagram illustrating a quad pixel arrangement method when the color EPD device of FIG. 3 is a low resolution square or landscape type.

4B is a diagram illustrating a stripe-type pixel arrangement method when the color EPD device of FIG. 3 is a low resolution square or landscape type.

5A is a diagram illustrating a quad pixel arrangement method when the color EPD device of FIG. 3 is a portrait type with a low resolution of 3: 4.

FIG. 5B is a diagram illustrating a stripe-type pixel arrangement method when the color EPD device of FIG. 3 is a low resolution portrait; FIG.

FIG. 6 is a cross-sectional view showing a driving state of a color EPD device according to a second embodiment of the present invention, showing when a high resolution image of white (or almost white) is implemented as a gray level or more in a W pixel; FIG.

FIG. 7A illustrates a quad pixel arrangement method when the color EPD device of FIG. 6 is a high resolution square or a landscape type.

FIG. 7B is a diagram illustrating a stripe-type pixel arrangement method when the color EPD device of FIG. 6 is a high resolution square or landscape type. FIG.

8A is a diagram illustrating a quad pixel arrangement method when the color EPD device of FIG. 6 is a high resolution 3: 4 ratio portrait type;

FIG. 8B is a diagram illustrating a stripe type pixel arrangement method when the color EPD device of FIG. 6 is a high resolution portrait type; FIG.

Claims (14)

A plurality of gate lines and data lines crossing each other to define a unit pixel region, a thin film transistor formed at an intersection of the gate line and the data line, and a pixel electrode formed in the unit pixel region A substrate; Red (R), green (G), blue (B) color filters and bags (W) filter regions disposed corresponding to pixel electrodes formed on the unit pixel regions of the first substrate, and the color filter image. A second substrate formed in the substrate and including a common electrode facing the pixel electrode; In the color EPD device provided between the first substrate and the second substrate, a plurality of microcapsules forming an electrophoretic device comprises an EPD film sealed with a binder to form a film, When the gray in the W pixel is equal to or less than the middle gray and is black or close to black, the pixels of G, R, B, and W form a pixel array in a quadrangle in the odd-numbered and even-numbered horizontal lines. A pixel arrangement method of a color EPD device, characterized in that the pixels of G, R, B, and W are arranged in a pixel array in an odd-numbered vertical line and an even-numbered vertical line. The pixel arrangement method of claim 1, wherein the unit pixels of G, R, B, and W may be formed in the same ratio in length and width. The pixel arrangement method of claim 1, wherein the unit pixels of G, R, B, and W can be formed at a ratio in which the length of the vertical is greater than the length of the horizontal. The pixel arrangement method of claim 1, wherein the unit pixels of G, R, B, and W are arranged in the order of G, R, B, and W in a clockwise direction with respect to G. A plurality of gate lines and data lines crossing each other to define a unit pixel region, a thin film transistor formed at an intersection of the gate line and the data line, and a pixel electrode formed in the unit pixel region A substrate; Red (R), green (G), blue (B) color filters and bags (W) filter regions disposed corresponding to pixel electrodes formed on the unit pixel regions of the first substrate, and the color filter image. A second substrate formed in the substrate and including a common electrode facing the pixel electrode; In the color EPD device provided between the first substrate and the second substrate, a plurality of microcapsules forming an electrophoretic device comprises an EPD film sealed with a binder to form a film, When the gray in the W pixel is equal to or less than the middle gray and is black or close to black, the pixels of G, R, B, and W form a pixel array in the odd horizontal lines and the even horizontal lines. A pixel arrangement method of a color EPD apparatus, wherein pixels of G, R, B, and W are arranged in a pixel array in the odd-numbered vertical lines and the even-numbered horizontal lines. 6. The pixel arrangement method of claim 5, wherein the unit pixels of G, R, B, and W can be formed in the same ratio of length and width. 6. The pixel arrangement method of claim 5, wherein the unit pixels of G, R, B, and W can be formed at a ratio in which the vertical length is larger than the horizontal length. A plurality of gate lines and data lines crossing each other to define a unit pixel region, a thin film transistor formed at an intersection of the gate line and the data line, and a pixel electrode formed in the unit pixel region A substrate; Red (R), green (G), blue (B) color filters and bags (W) filter regions disposed corresponding to pixel electrodes formed on the unit pixel regions of the first substrate, and the color filter image. A second substrate formed in the substrate and including a common electrode facing the pixel electrode; In the color EPD device provided between the first substrate and the second substrate, a plurality of microcapsules forming an electrophoretic device comprises an EPD film sealed with a binder to form a film, When the gray of the W pixel is equal to or greater than the middle gray and is white or close to white, the pixel arrays of the first group of G, R, B, and W are quadrangular from the horizontal line of the first column and the horizontal line of the second column. The first group and the second group of pixels are alternately formed to form a pixel array of the second group B, W, G, and R in a quadrangle in the horizontal lines of the third column and the fourth column, or the first column is vertical The pixel arrays of the first group G, R, B, and W are quad-shaped in the vertical lines of the lines and the second column, and the second groups of B, W, G are quad-shaped in the vertical lines of the third and fourth columns. And pixels of the first group and the second group are alternately arranged so as to form a pixel array of R. 2. The unit pixel of the first group of G, R, B, W and the unit pixel of the B, W, G, R of the second group may be formed in the same ratio in the length and width of the first group. A pixel arrangement method of a color EPD device, characterized in that. The unit pixel of the first group of G, R, B, W and the unit pixel of the B, W, G, R of the second group are formed at a ratio in which the longitudinal length is larger than the horizontal length. And a pixel arrangement method of a color EPD device. The method of claim 8, wherein the unit pixels of G, R, B, and W of the first group are arranged in the order of G, R, W, and B in a clockwise direction with respect to G, and B, W, The unit pixels of G and R are arranged in the order of B, W, R, and B in a clockwise direction with respect to B. The pixel arrangement method of a color EPD device. A plurality of gate lines and data lines crossing each other to define a unit pixel region, a thin film transistor formed at an intersection of the gate line and the data line, and a pixel electrode formed in the unit pixel region A substrate; Red (R), green (G), blue (B) color filters and bags (W) filter regions disposed corresponding to pixel electrodes formed on the unit pixel regions of the first substrate, and the color filter image. A second substrate formed in the substrate and including a common electrode facing the pixel electrode; In the color EPD device provided between the first substrate and the second substrate, a plurality of microcapsules forming an electrophoretic device comprises an EPD film sealed with a binder to form a film, When the gray in the W pixel is equal to or greater than the middle gray and is white or close to white, the pixel arrays of the first group of G, R, B, and W are formed in the stripe type from the odd horizontal line and in the even horizontal line. The first group and the second group of pixels are alternately formed to form a pixel array of the second group B, W, G, and R in the stripe type, or the first group G, R, The pixels of the first group and the second group are alternately arranged to form a pixel array of B and W, and to form a pixel array of the second group of B, W, G, and R in the stripe type in the even-numbered vertical line. Pixel arrangement method of color EPD device. The unit pixel of the first group of G, R, B, W and the unit pixel of the B, W, G, R of the second group may be formed in the same ratio in the length and width of the first group. A pixel arrangement method of a color EPD device, characterized in that. 13. The method of claim 12, wherein the unit pixels of G, R, B, and W and the unit pixels of B, W, G, and R of the second group may have a vertical length that is greater than a horizontal length. A pixel arrangement method of a color EPD device.

Images